Alexander francis garden brown



(No Model.)

A. F. G. BROWN.

ROTARY ENGINE.

No. 478,843. Patented July 12, 1892.

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ALEXANDER FRANCIS GARDEN BROWN, OF SWINDRIDGE MUIR, DALRY, SCOTLAND.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 478,843, dated July 12, 1892. Application led April 15, 1891. Serial No. 389.056. (No model.) Patented in England October 26, 1889, No. 16,913.

To @ZZ whom it may concern.-

Beit known that I, ALEXANDER FRANCIS GARDEN BROWN, a citizen of the United Kingdom of Great Britain and Ireland, residing at Swindridge Muir, Dalry, in the county of Ayr, Scotland, have invented new and useful Improvements in Rotary Engines, (which have not been patentedin any country except Great Britain by Letters Patent dated the 2Gth'day of October, 1889, No. 16,9135) and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art or manufacture to which it relates to make and use the same.

This invention relates to improvements in sin gle-actin g and in reversing rotary engines, and it is a further development of the invention for which Letters Patent of the United Kingdom of Great Britain and Ireland, dated the 2d day of February, 1888, No. 1,555, and also Letters Patent of the `United States of America, dated the 28th day of January, 1890, No. 420,331, have been granted to me for improvements in rotary engines.

Figure 1 is a sectional elevation of an engine embodying my invention. Figs. 2, 3, and 4 are detail views thereof. Fig. 5 is a View of the crank or eccentric for the locking device.

Under the present invention the piston G is keyed direct to the said shaft C. The packing-strip ct, extending across the breadth of the piston, and the similar strips extending down the ends of the piston are, as seen at Figs. 2, 3, and 4, made in two pieces dovetailed or rabbeted into each other at the center, and at the said joints springs o. are inserted, the tendency of which is to force the two parts of the strips asunder, so as to insure that, notwithstanding tear and wear of the parts, the strips shall always bear steam-tight against the interior of the cylinder, and more particularly in the corners. Under the strip a and within the end strips a thin plate Z) is situated.

Fig. 1 represents an arrangement in which each arm H has two horns or branches extending in opposite-directions from its boss, and in single-acting engines a steam-passage 1, communicating with the distributing valvecasing J, is made in the recess of the cylinder engine.

the other branch of the arm when it is not necessary that the said passage should be or branch in front of one steam-passage 1 is thrown out against it the other horn or branch of -the said arm is thrown back, so as to uncover its exhaust-passage 2, while at the same time theV piston moves out the corresponding horn or branch of the other arm to cover its exhaust-port 2. In reversing engines steam admission and exhaust passages are provided, as described, in conjunction with both horns or branches of each arm, thevarrangement in either case having the effect of lessening or preventing shock and noise in working the To insure that the arms shall only move at the proper times, a bolt 3 is or may be provided in conjunction with the steamdistributing horn of each arm, the said bolt being connected to a rocking lever 4, worked by a crank or eccentric from the main shaft, so as to be entered into andwithdrawn from the point of the said horn or branch at the required times.

Having now described the invention, what I desire to claim and secure by Letters Patent 1. In a rotary engine, the combination of a cylinder having its interior recessed with admission-portsleadingfrom distributing-valves to said recesses, a rotating segmental piston in said cylinder keyed direct to the main shaft, packing for said pistons, consisting of strips, each made in two pieces, dovetailed one into the other and spread apart by springs, said strips being forced against the surface of the cylinder by springs situated in recesses made in the piston and acting against interior pressure-plates, and two or more branched arms arranged to alternately lie in and be extended to the piston-face from said recesses, said arms having exhaust-ports therein, and means operated from the main shaft for locking and unlocking said arms, substantially as described.

2. In a rotary engine, the combination of a cylinder having its interior recessed with admission-portsleadingfromdistributing-valves 'open for the exhaust of steam. Vith this construction as the piston G rotates and the horn IOO to said recesses and exhaustports leading ingF lever worked by a crank or eccentric from from said recesses to exhaust pipes or pasthe main shaft, substantially as described. sages, a rotating segmental piston in said eyl In Witness whereof I have hereunto set my I5 inder keyed direct to the main shaft, and two hand and seal this 21st day of November, 1890.

5 arms arranged to alternately lie in and be ex- ALEXANDER FRANCIS GARDEN BROWN. [n s] tended to the piston-face from said recesses, Witnesses: each arm having two branches extending in GEO. N. CRUIKsI-IANK, opposite directions from its boss and one of Fel. Inst. Patent Agents, G2 S15. Vincent Street, which when the arm lies in the recess covers Glasgow. 1o or closes the exhaust-passage, and means for XVALLACE FAIRWEATHER,

locking and unlocking said arms, consisting (l E., Fel. Inst. Patent Agents, (52 Sd. Vincent of bolts, said bolts being connected to a roek- Street, Glasgow. 

